extract for dll

/*
0) extern "C" __declspec(dllexport)
   - - - - - - - - - - - - - - - - -
1) int (*_rr)();
2) HMODULE  hDll = 0;
3) hDll = LoadLibrary("dll/for.dll");
4) _rr = (int(*)())GetProcAddress(hDll, "_rr");
5) FreeLibrary(hDll);
*/




// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
// File dllmain.cpp

#include <windows.h>


//              !!!   Обязательно инициализируйте в этой области все массивы и переменные   !!!
                //*******************************    For Microsoft compiler    ****************
#ifdef _MSC_VER //*****************************************************************************
#pragma data_seg("SSComp")                                // совместный доступ к переменным dll


int        _n  = 123,

       arr[22] = {0};

#pragma data_seg()
#pragma comment(linker,"/section:SSComp,rws")
#endif













#ifdef __GNUC__ //*******************************     For GCC compiler      ******************
                // !!! Обязательно инициализируйте в этой области все массивы и переменные !!!

 __declspec (dllexport) int        _n              __attribute__((section (".shared"), shared))
                                       = 123;

 __declspec (dllexport) int    arr[22]             __attribute__((section (".shared"), shared))
                                       = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
#endif






BOOL APIENTRY DllMain (HINSTANCE hInst,         // Library instance handle.
                       DWORD    reason,         // Reason this function is being called.
                       LPVOID reserved)         // Not used.
{
    switch(reason)
    {
      case DLL_PROCESS_ATTACH:
                               break;

      case DLL_PROCESS_DETACH:
                               break;

      case DLL_THREAD_ATTACH:
                               break;

      case DLL_THREAD_DETACH:
                               break;
    }


    return TRUE;                                              // Returns TRUE on success, FALSE on failure
}





////////////////////////////////
extern "C" __declspec(dllexport)
/////////////////////////////////////////////////////
int _rr()                                          //
{

return 1142;
}



// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
// File main.cpp




#include   <windows.h>
#include     <stdio.h>



HMODULE  hDll = 0;


int (*_rr)();


////////////////////////////////////////////////////
int main()                                        //
{


    hDll = LoadLibrary("dll/for.dll");

    if(hDll == 0)
    {

       printf("Error LoadLibrary\n");
       return 0;
    }

   _rr = (int(*)())GetProcAddress(hDll, "_rr");

    if(_rr == 0)
    {

       printf("Error Get Proc\n");
       FreeLibrary(hDll);
       return 0;
    }

    printf("_rr() = %d", _rr() );

    FreeLibrary(hDll); Sleep(2000);

return 0;
}